Hey man, I think your girls look great. Nice color and size for 2 weeks. They should start taking off this week. How tall they start getting depends on many factors but the type of light and distance from the canopy can be a big one. There may be a lot of info out there on your light already. It's going to take a few grows to learn your light.
BTW, I have a couple diaries going where I'm growing FastBuds in coco with organic amendments and growth has been off the charts in 4 weeks. And I'm still learning how to use my light. Peace